... .12 , 1/4"-1/2" Certification: ISO9001, ISO14001 Features: nickel gasket lock washer 1.StandardDIN137, DIN 6797. DIN6798, ANSI B 18 ... etc. 4.Inside Diameter 2.2 to 30 mm nickel gasket lock washer :5.Outside diameter 4.7-46.3mm 6 ... . It integrates exploitation, design, sales and service into one. nickel gasket lock washer